Since that year, the characteristic cover color of the map books has been red.
The first maps showed the reduced size of Mexico City in the 1920s.
However, as the city has kept constantly growing, suburban areas in the surrounding State of Mexico have added to the maps.
Many modern Guía Roji editions include a plastic flat magnifying glass, entire Metro networks for Mexico City and Monterrey, and, for the Mexico City edition, a folding map containing the Distribuidor Vial and the Centro Histórico.
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